The Hydrogen cells which plug into these devices need to be refilled either by sending them back to the manufacturer, or merely buying new cartridges. What is needed instead are Hydrogen cells which are rechargable via any household outlet, just like Lithium batteries can be re-charged. The TCWS technology in proprietary development by Off Grid Hydrogen.tech is a type of hydrogen system which in theory should ultimately be rechargable merely by plugging into household electrical outlets, or more ambitiously via a camp fire rocket stove (to reach high temperature) and a solar panel (less electricity is required if temperature provided by stove heat) for truly off grid power. More about this shall be described on the TWCS page once monthly subscriptions are active.

Brunton manufactured these a few years ago and there are numerous third party resellers of these online now, but Brunton no longer manufactures these units and instead focuses instead on its navigation product lines. The Wired magazine article explains that Brunton was based on the Horizon model.

I find in practice that this 2.6 Ah device only charges my iPhone once, which technically does not use up all the stored power in the brick. However, what remains is not enough for a next full charge so I just consider that remaining amount useless and recharge it after one charge. These were on sale for $2 when I bought mine.

I find in practice that this 4 Ah device does charge my iPhone twice, but it seems to stop charging and I have to reconnect it and fiddle and diddle to make sure it is charging, which is less than trustworthy. Technically such charging does not use up all the stored power in the brick. However, what remains appears not enough for a next full charge so I just consider that remaining amount useless and recharge it after one charge. These were on sale for $6 with a few last remaining models for $4 when I bought mine. Maybe that's why the sockets are faulty.

I have not yet tested this 50 Ah device but that does sound like more than 10 times an increase in capacity very much worth twice the price (as long as the sockets don't fail and no fiddle and diddle is required to make sure it is actually charging unattended).